In the context of this specific release string, "DC" likely refers to the Distribution Channel or Download Center , signifying this was a standalone installer version rather than a subscription-based "Office 365" update.
At the time of this release, Microsoft focused on enhancing the integration between macOS and Office apps. Notable additions included: Microsoft Office 2019 16.23 DC 27.03.2019
This build included critical fixes for remote code execution vulnerabilities identified in early 2019. Current Status & Support In the context of this specific release string,
This is the version number. In early 2019, Microsoft updated Office for Mac to version 16.23, which introduced several new features and security patches. Microsoft Office 2019 16.23 DC 27.03.2019
Improved transition effects for smoother presentations.
A distraction-free writing environment that hides all toolbars and taskbars.